Truing lathe for wood-pulp grinders



} TRUING LATHE FOR WOO D PULP GRINDERS Orizinai Filed oct.'14, 1922 2 Sheets-Sheet 1 MATTORNEYQ Septj 13', 1927. 64 53 J. J. WARREN TRUING LATHE FOR woon PULP GRmnaRs Original Filed Oct. 14 192.2 2 Sheets-Sheet 2.

INVENTOR m I x A," ATTORNEY 6 Patented Sept, 13, 1927 .fo'riiv kitties WARREN, cemeteries, sees.

; TRUINGuLATI-IE FOR woonrcnr GRINDERS.

Original application filed October 14, 1922, Scria1 No. 594,501. Divided and this application filerlMarch .4, 1924. Serial No. 696,781.

This invention relates to the grinding of wood into the so-called mechanical pulp used in the manufacture of newsprint and In accordance with this invention, Ihave provided a truing lathe particularly adapted for truing the grindstone of a grinder of the type disclosed in my copending application, Serial No. 594,501. The novel features of this truing lathe and its mounting are: firstit extends beyond the grindstone hous- 1 ing on either side thereof, so that the carriage of the lathe can be run completely outside the housing for adjustment; second-the en tire lathe can be shiftedlaterally so that the stone can be trued even when worn beyond "it-11G original limit of the lathe adjustment;

7 stone. I

and'third-a narrow door extends across thev 'width of the housing making it possible to follow the carriage across the face of the A preferred embodiment of my invention is shown in the accompanying drawing, in

which Figurel'represents an elevation of the lower end of a magazine grinder constructed in accordance with the disclosure.

7 in my copending application, and Figure 2 is an elevation of the lower end of the same grinder, but looking in a direction at-right' angles to that in, which Figure 1 is viewed.

The grinder shown in this figure comprises 3 the ordinary cylindrical grindstone 21 en closed within a housing 24, and mounted on a shaft 22 .Thehousing itself is supported by sole plates 80-. Adjustably'mounted on thehousing 24, and located centrally over the 1 grindstone is a vertical magazine 29 into the upper end ofwhich is placed the wood to be ground. This wood is positively and continuously forced against the grindstone by means of a series ofen-dless chains 30, two located at each of thetwo opposite sides of the magazine parallel with the shaft- 22.

The o "eration of these chains has been de scribe in impending applieation, and will not be repeated here as it forms no part of the present invention.

Situatedat the bottom of the housing and mounted upon the sole plates 80, are a series of brackets 88 upon which is mounted the guideway 85 of the truing lathe, upon which the carriage 108 is mounted for sliding movement. Extending inwardly from the body of this carriage is the ordinary burr 109; which contacts with the cutting face of the grindstone and trues it. Adjustment of the burr toward and away from the grindstone is effected in the first instance by means of a hand wheel 110 and its associated mechanism. Transverse movement of the carriage across the. face of the grindstone is.

effected by means of a feed screw 111 which makes contact with a half nut on the lathe.

-Rotation of this feed screw is effected by means of a hand wheel 112.

The guideway 85'extends beyond the housclearly in Figure 2. Thus when adj ustments become necessary they can be made wholly without the housing, and it is unnecessary for the operator to extend his arms within the housing and in dangerous proximity to the rapidly rotating stone.

Although movement of the burr toward and away from the stone is effected in the first instance by means of hand wheel 110 Y and its associated mechanism, it often happens that the grindstone wears down to a point where further inward movement of the burr becomes impossible through this means. In accordance with the present invention. 1 have so mounted the guideway uponthe brackets 88 that it can be moved bodily when the necessity arises and the range over which:

thelathe is adjustable thus increased;

In order to follow the carriage across the 1 .face of the guideway, I have provided a narrow door 86 in the'base of the housing.

I. claim:

1.v In a wocdpulp grinder. the combination of a grindstone, a housing therefor, a truing iathe inth housin a guideway the-refer housing lea therefrom. so that the lathe carriage can he run out of the housing when necessary.

2. In a wootlpulp grintlen the eo1nhination of :1 grindstone, :1 housing therefor, 21, ttuingz lathe in the housing, a hurt on the lathe, a guitlewuy for the lathe parallel to the face of the stone. means for moving: the lathe along the guidoway longitudinally of the face of the stone means for moving the lTtUI toward and away from the stone, tnnekets supporting the gg'uitlewny, and means for movin the guitlewny and lathe on tho brackets transversely of the time of tho stone.

In testimony whereof I aitl'ix my signature.

JOHN JAMES \VARREN. 

